最新刊期

  • CHEN Jinliang,QU Dan,ZHAO Wenxin,AN Li,SUN Zaicheng

    Corrected Proof
    DOI:10.37188/CJL.20230335
    摘要:In recent years, with the development of carbon dots in terms of synthesis routes, reaction mechanisms, and optical properties, a large amount of work has focused on carbon dots that emit long wavelengths such as infrared or near-infrared. Long wavelength refers to the red or near-infrared spectral region whose emission range is 600-1800 nm. Compared with short-wavelength carbon dots, they have the characteristics of deep tissue penetration, less autofluorescence, long fluorescence lifetime and less light damage, and can be further applied in the fields of biomedical treatment, optoelectronics and optical device preparation. Therefore, in-depth exploration of the design and synthesis of long-wavelength emitting carbon dots is of great significance for their development and wide application. This article reviews the research progress of long-wavelength carbon dots in recent years, and introduces how to prepare long-wavelength carbon dots from two aspects: carbon source selection and control of optical properties. For example, choose some aliphatic compounds containing more amino groups and aromatic compounds with conjugated structures. And its optical properties can be controlled through changes the effective conjugation length, surface modification, and heteroatom doping. Finally, the latest research and future challenges of long-wavelength carbon dots in some fields such as biomedicine, LED optics, encryption and anti-counterfeiting are introduced.  
    关键词:long-wavelength emission;carbon dots;optical properties;application   
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    发布时间:2024-04-10
  • XIE Xin,GE Wanyin,ZHANG Qian,YANG Maohao,WU Chenge,HE Peng,YIN Honglei

    Corrected Proof
    DOI:10.37188/CJL.20240021
    摘要:Near-infrared phosphors have garnered significant research attention due to their unique physical properties and their broad application prospects. In this work, we synthesis the Sr9Ga(PO47:0.8Cr3+ near-infrared phosphors through high-temperature solid phase reaction. The Sr9Ga(PO47:0.8Cr3+ emitted light at a wavelength of 833 nm with a full width at half maximum of 117 nm excited by blue light at 460 nm. Rare-earth ions were also incorporated into the Sr9Ga(PO47:0.8Cr3+,Yb3+ and Sr9Ga(PO47:0.8Cr3+,Nd3+. The Sr9Ga(PO47:0.8Cr3+ were compared with Sr9Ga(PO47:0.8Cr3+,Yb3+ which emits characteristic peaks of Cr3+ and Yb3+ when excited by 460 nm blue light. Spectroscopic analysis and decay curves changes confirms the existence of a Cr3+-Yb3+ energy transfer channel with a maximum energy transfer efficiency of 80.2%. The thermal stability of Sr9Ga(PO47:0.8Cr3+,Yb3+ has improved the overall fluorescence spectrum by about 3.7 times due to the excellent thermal stability of Yb3+. Sr9Ga(PO47:0.8Cr3+,Nd3+ samples were designed and synthesized to shows the multi-peak emission at 833, 876, and 1060 nm. Finally, we discuss the potential applications of these phosphors in temperature sensing and non-destructive testing, demonstrating their exciting application prospects.  
    关键词:Sr9Ga(PO47: 0.8Cr3+;NIR phosphors;Yb3+;Nd3+   
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    发布时间:2024-04-10
  • JIANG Yan,GAO Feng,LI Lin

    Corrected Proof
    DOI:10.37188/CJL.20240007
    摘要:Currently, photodetectors with broadband-narrowband dual-mode detection modes are popular in special applications. Traditional photodetectors with dual-mode detection modes are achieved by adding different filters to the broadband photodetectors. However, complex optical components increase the manufacturing cost of photodetectors and the complexity of device integration. Based on the above problems, we prepared MAPbCl3/MAPbBr3 perovskite single crystal heterojunction through a simple solution hot pressing method, and built a photodetector with adjustable detection band based on the single crystal heterostructure. When the incident light is incident from the side of the MAPbCl3 single crystal, the device shows high responsivity (∼0.05 A W-1) and high spectral suppression ratio (∼55) only to the visible part (400-600 nm), and its rise time and decay times are 4.1 μs and 620 μs. When light is incident from the side of the MAPbBr3 single crystal, the device has an obvious and continuous light response to the ultraviolet-visible part (300-600 nm). Therefore, our proposed solution hot pressing method and single-crystal heterostructure provide an effective solution for the preparation of high-performance photodetectors with tunable detection wavelengths.  
    关键词:photodetector;perovskite;single crystal;multi-band detection   
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    发布时间:2024-04-10
  • LE Xuxing,WANG Yan,ZHU Zhaojie,LI Jianfu,TU Chaoyang

    Corrected Proof
    DOI:10.37188/CJL.20240061
    摘要:Crystals of Er3+/Yb3+/Pr3+: SrLaGaO4, Er3+/Yb3+: SrLaGaO4, and Er3+: SrLaGaO4 were successfully grown using the non-stoichiometric ratio Czochralski method, and detailed spectroscopic analyses were conducted. Additionally, thermal performance analyses were performed on pure SrLaGaO4 crystals. Compared with Er3+: SrLaGaO4 crystal, Er3+/Yb3+/Pr3+: SrLaGaO4 crystal not only shows better absorption characteristics but also exhibits weaker near-infrared emissions, as well as superior mid-infrared emissions. Furthermore, the self-termination effect for the 2.7 μm erbium laser is suppressed successfully since the fluorescence lifetime of the 4I13/2 lower level of Er3+ decreases markedly while that of the upper 4I11/2 level falls slightly in Er3+/Yb3+/Pr3+: SrLaGaO4 crystal. Besides, the sensitization effect of Yb3+ ion and deactivation effect of Pr3+ ion as well as the energy transfer mechanism in Er3+/Yb3+/Pr3+: SrLaGaO4 crystal were studied in this work. In conclusion, the introduction of Yb3+ and Pr3+ ions is favorable for achieving an enhanced 2.7 μm emission in Er3+/Yb3+/Pr3+: SrLaGaO4 crystal which can act as a promising candidate for mid-infrared lasers.  
    关键词:SrLaGaO4 crystal;Er3+ doping;crystal growth;Mid-infrared laser crystal;spectroscopic analysis   
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    发布时间:2024-04-10
  • CHEN Zhongliang,HU Wentao,WANG Xuelu,XU Jinghua,SUN Chao,YAO Yefeng

    Corrected Proof
    DOI:10.37188/CJL.20240053
    摘要:Interface engineering at the bottom can effectively enhance the efficiency and stability of perovskite solar cells. In this study, the surface modifier, bis(triphenylphosphine) cobalt chloride (BTPPCC), was employed as a pre-buried interface modifier, successfully passivating the surface-enriched defects of MAPbI3 perovskite films. This optimization improved the interface contact between the perovskite film and the underlying hole transport layer (HTL), enhancing the crystalline performance of the perovskite absorption layer. Additionally, BTPPCC effectively suppressed non-radiative recombination at the interface, improving the long-term stability of the device. As a result, the power conversion efficiency (PCE) of the p-i-n type device increased from 18.37% to 20.12%. The unencapsulated device maintained an efficiency of over 76% after continuous operation for nearly 500 hours in an ambient air environment with a relative humidity (RH) of 50% at room temperature. This study provides an effective method for optimizing the buried interface in perovskite solar cells.  
    关键词:perovskite solar cells;buried bottom interface;defect passivatio   
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    发布时间:2024-04-10
  • YANG Rui,LI Ziyue,SHEN Yi,GUO Lihua,ZHOU Bingshuai,LI Jiawei,LIU Haipeng,DONG Biao

    Corrected Proof
    DOI:10.37188/CJL.20240052
    摘要:Circulating tumor cells (CTCs) are cells that are shed from the primary or metastatic site of a malignant tumor and circulate through the bloodstream to reach the body. Therefore, the presence of CTCs in vivo can reflect the occurrence and development of tumors, which is crucial for the diagnosis and prognosis of tumors. However, there are still many challenges to achieving high purity capture and post-capture CTCs inactivation blocking. Among the schemes developed for selective separation of CTCs, fluorescence method has an important application prospect in non-invasive detection and rapid detection because of its high sensitivity, high resolution and simple operation. Compared with previous CTCs research reviews, this paper describes in detail the whole process of CTCs from in vitro capture to in vivo capture to downstream analysis, and systematically and in detail summarizes the complete diagnosis and treatment process of CTCs, providing new ideas for current research. This is of great significance for the diagnosis and treatment of early circulating tumor cells.  
    关键词:circulating tumor cells;fluorescence;capture;downstream analysis;inactivate   
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    发布时间:2024-04-10
  • WANG Shijie,WANG Yinghan,TAO Zhengren,AN Zhengce,YE Shi

    Corrected Proof
    DOI:10.37188/CJL.20240073
    摘要:Eu2+-doped Na3Sc2(PO43 ionic conductor possesses superior thermal quenching(TQ)resistance, which is considered as a promising phosphor for high-power lighting applications. Yet the underlying mechanism of negative thermal quenching(NTQ)is not fully understood. In this study, we focus on upconversion(UC)and downshifting(DS)luminescence of Yb3+/Er3+ with f-f transition rather than susceptible d-f transition of Eu2+ in Na3Sc2(PO43, aiming to get a more insightful view. The results show that thermally accelerated dynamic defects/ions contributes to the significant negative thermal quenching(NTQ)of UC luminescence and thermally stabilized DS luminescence by promoting the radiative transition and suppressing the non-radiative transition. The UC process with slow population rate is more susceptible to perturbation of Na+ migration process with time scale equivalent to that of the former, resulting in evident NTQ of UC luminescence. This research opens an avenue for understanding the NTQ mechanism of luminescence via dynamic defects/ions.  
    关键词:Na3Sc2(PO43: Yb3+, Er3+;upconversion luminescence;Downshifting Luminescence;Negative thermal quenching;energy transfer   
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    发布时间:2024-04-08
  • LI Xinyun,DAI Mengmeng,FU Zuoling

    Corrected Proof
    DOI:10.37188/CJL.20240055
    摘要:The up-conversion luminescent material KYb2F7: 2% Er3+ was synthesized using the hydrothermal method. The synthesized sample was confirmed to be pure phase with an orthorhombic morphology by X-ray diffraction and scanning electron microscopy. Under 980 nm laser excitation, the sample exhibited two green emission peaks at 527 nm and 543 nm, as well as a dominant red emission peak at 655 nm. The temperature-dependent upconversion (UC) emission spectra showed that the emission intensity at 545 nm and 655 nm exhibited thermal quenching with increasing temperature. Based on the mechanism of thermal coupling temperature measurement, the temperature sensing performance of 2H11/24I11/2 and 4S3/24I11/2 thermal coupling energy levels of Er3+ was studied, and the luminous intensity ratio (LIR), absolute sensitivity (Sa), relative sensitivity (Sr), temperature uncertainty (δT), and repeatability (R) of the luminous thermometer were calculated. The maximum relative sensitivity was 0.99% K-1 at 313 K, the minimum temperature uncertainty was 0.73 K at 313 K, and the repeatability exceeded 99%, ensuring the reliability of the thermometer. All the experimental results indicate that KYb2F7: 2% Er3+ has potential application value in temperature sensing.  
    关键词:hydrothermal method;KYb2F7: Er3+;up-conversion luminescence;Temperature sensing performance   
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    发布时间:2024-04-08
  • CHANG Mingru,SHI Linlin,HUA Yulu,JI Ting,LI Guohui,XU Bingshe,DONG Hailiang,CUI Yanxia

    Corrected Proof
    DOI:10.37188/CJL.20240056
    摘要:Novel near-infrared organic photodetectors have wide application prospects in biosensing, medical imaging, and wearable electronics with the advantages of low cost, solution-spin coating, good biocompatibility, and flexible. Compared with diode organic photodetectors, high sensitive photomultiplication organic photodetectors have attracted enormous attention because of their higher external quantum efficiency (EQE>100%). The mechanism of the photomultiplication involves a type of carrier being trapped near the electrode, which assists another opposite polarity carrier tunneling into the active layer from the extra circuit. However, the performances of the device are limited by the number of traps. In this work, inorganic ZnO nanoparticles (NPs) are added into the active layer to enhance the photocurrent of the device through increasing the number of electron traps, and fortunately the dark current density of the device is maintained. It is found that the photocurrent of the device is improved by 7.4 times with optimal 5% ZnO NPs, compared with control device without ZnO NPs, under the reverse bias of -15 V, 850 nm illumination. Besides, the Al2O3 interface modification layer is further inserted into the device to improve performance of the device. The results show that the Al2O3 based device has bi-direction response for both reverse and forward bias via changing the interface contact characteristics near anode. Ultimately, the device obtains high EQE and R up to 105% and 104 A/W at a broad wavelength range of 380~1310 nm, applied with a forward bias of 15 V. This work provides a new idea and method for the development of high-sensitivity organic photodetectors.  
    关键词:near-infrared;photomultiplication;organic photodetectors;inorganic nanoparticles;interface modification   
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    发布时间:2024-04-08
  • WANG Qiang,LIU Wei,DU Yusong,LI Huan,ZHANG Zhijun,RAO Guanghui,CHENG Shuai,ZHAO Jingtai

    Corrected Proof
    DOI:10.37188/CJL.20240017
    摘要:A novel Ca5-xGa6O14: xSm3+ mechanoluminescent (ML) material was successfully prepared by high-temperature solid-state reaction method. The crystal structure, surface morphology, photoluminescence, ML properties and luminescence mechanism of Ca5-xGa6O14: xSm3+ were investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflection spectra, photoluminescence excitation and emission spectra, luminescence decay, ML spectra and thermoluminescence spectra. Under the excitation of 404 nm, the emission peaks at 562, 599, 642 and 715 nm is detected in Ca5-xGa6O14: xSm3+, corresponding to 4G5/26Hj(j=5/2、7/2、9/2、11/2)characteristic emission of Sm3+. With the increase of Sm3+ content, the luminescence intensity first increases and then decreases, the optimal luminescence intensity is obtained at x=0.07 and the decay time decreases from 1.92 to 1.30 ms. Under the sliding friction, ML emission band is obtained in Ca5-xGa6O14: xSm3+, and the ML intensity increase linearly with applied stress, indicating that the material has potential application in the field of stress sensors.  
    关键词:mechanoluminescence;Ca5Ga6O14;Sm3+   
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    发布时间:2024-04-02
  • WANG Xi,LI Yuanyuan,LIU Gang,WANG Tiancong,WANG Yu,NIU Haoyu,LI Yajing,ZHANG Mingliang,SHI Changzhe,WANG Yue,HE Juan,LI Kai

    Corrected Proof
    DOI:10.37188/CJL.20240041
    摘要:In this paper, using the MOFs material of MIL-96 as the carrier, allyl fluorescein as the fluorescent group, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the crosslinking agent, azobisisobutyronitrile as the initiator, a novel surface molecularly imprinted fluorescence sensor (MIL-96@AF-SMIPs) for the detection of Rhodamine B was prepared by precipitation polymerization. The sensor was characterized by scanning electron microscopy, fourier transform infrared spectroscopy and X-ray diffraction, which proved the surface molecularly imprinted fluorescence sensor has been successfully synthesized. In the detection of Rhodamine B, the fluorescence intensity ratio I580/I522 showed a good linear relationship with the concentration of Rhodamine B in the range of 0-0.5 μmol/L (R2 = 0.999). The detection limit was 8.03 nmol/L. In addition, the sensor exhibited high selectivity, good reusability and excellent fluorescence stability. The recovery of Rhodamine B in real sample analysis was 94.23%-109.07%, and the relative standard deviation was less than 3.75%. This study provides a feasible method for efficient and rapid detection of Rhodamine B.  
    关键词:fluorescein;molecularly imprintied;fluorescence detection;rhodamine B   
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    发布时间:2024-03-29
  • ZHANG Tianyang,PEI Ruijie,SHI Yun,YOU Bo,LÜ Bin

    Corrected Proof
    DOI:10.37188/CJL.20230329
    摘要:The Dy2Zr2O7 powder with an average particle size of ~150 nm was prepared by a solid-state reaction method from the chemically precipitated Dy2O3 particle and the commercial ZrO2 powder. After cold isostatically pressing and vacuum sintering, the magneto-optical transparent Dy2Zr2O7 ceramic was successfully fabricated. The obtained Dy2Zr2O7 ceramic material has the typical defective fluorite structure feature with an in-line transmittance of ~68% at 635 nm (~88% of the theoretical transmittance). The developed magneto-optical transparent Dy2Zr2O7 ceramic has Verdet constants of -182 ± 7, -118 ± 2, -48 ± 1 rad T-1 m-1 at 635 nm, 780 nm and 1064 nm, respectively, which are roughly 1.33- and 1.24- fold higher than the commercial terbium gallium garnet crystal at 635 and 1064 nm, respectively. The results show that the Dy2Zr2O7 transparent ceramic is a potential new magneto-optical material.  
    关键词:Verdet constant;defective fluorite;Faraday effect;vacuum sintering;Dy2Zr2O7 transparent ceramics   
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    发布时间:2024-03-28
  • WANG Ke,ZOU Yuchen,XIAO Wancheng,YIN Longxiang,ZHANG Haifeng,WANG Xiaodong,FEI Xionghui

    Corrected Proof
    DOI:10.37188/CJL.20240042
    摘要:In recent years, it has been observed that several radiophotoluminescent materials used for radiation detection have been widely used in the fields of dose monitoring in nuclear decommissioning facilities, fluorescent nuclear trace detection, medical therapy, radiation imaging and visualisation of nuclear radiation sites due to their high measurable dose limits and wide dose ranges. This study provides an overview of the current research state of radiophotoluminescent materials suitable for high-dose measurements, including inorganic activator ion doping systems, inorganic undoped systems, and organic polymer systems. The focus is on reviewing the luminescence mechanism, basic characteristics, types, and application status of each system. At the same time, a comparative analysis is conducted to examine the causal relationship of the response to radiation doses and the performance advantages and disadvantages in different systems materials. This study aims to provide a summary of the current research on the enhancement of dose detection performance of radiophotoluminescent materials suitable for high-dose measurements. Concurrently, the feasibility measures for improvement and optimization are put forward, and the future development trend is forecasted.  
    关键词:radiophotoluminescence;high-dose measurement;inorganic activator ions;organic polymers   
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    发布时间:2024-03-28
  • LI Chao,SONG Hongwei,CHEN Cong

    Corrected Proof
    DOI:10.37188/CJL.20240037
    摘要:Single-crystal semiconductors such as silicon, germanium, and gallium arsenide consistently demonstrate higher photovoltaic conversion efficiencies in the field of solar energy. However, in the third-generation thin-film solar devices based on ABX3 type novel organic-inorganic hybrid metal halide perovskite materials, the latest certified efficiency of over 26% has been achieved using polycrystalline thin films, while the highest efficiency for single-crystal perovskite solar cells is approximately 24%, with limited related research. Polycrystalline perovskite thin films exhibit high-density intrinsic structural defects (grain boundaries, vacancy defects, impurity defects, antisite defects, etc.), leading to issues of poor device stability and hysteresis effects, among others. In contrast, single-crystal perovskites offer advantages such as absence of grain boundaries, low defect density, long carrier lifetimes, and long diffusion lengths. These characteristics position single-crystal perovskites as ideal candidates for high-performance optoelectronic devices. In the trajectory of semiconductor photovoltaic materials, the single-crystals remain the ultimate commercialization target. This review briefly outlines the basic device structure of single-crystal perovskite solar cells, systematically evaluates the advantages and disadvantages of various constituent single-crystal perovskite materials, explores diverse single-crystal perovskite material preparation/growth methods, and critically analyzes the latest research advancements, with an emphasis on the interplay between single-crystal perovskite material composition, device structure, preparation methods, and performance. It is hoped that this review will provide valuable insights to catalyze the development of highly efficient and stable single-crystal perovskite solar cells by researchers in the field.  
    关键词:perovskite solar cells;single-crystal perovskite;defects;space-limited inverse temperature crystallization   
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    发布时间:2024-03-27
  • LIU Yin,WAN Jie,XIAO Yongbao,YU Dechao

    Corrected Proof
    DOI:10.37188/CJL.20240046
    摘要:Mid-infrared fiber lasers operating at 3 μm bands have attracted considerable attention due to their potential applications in medicine, environmental monitoring, military defense, etc. One of the key foundations to achieve 3 μm mid-infrared fiber laser is the gain medium made by efficient and stable glass host materials with low phonon energy. In this study, novel Er3+-doped Al2O3-CaO-ZnO glasses were synthesized by melt-quenching method. Properties of thermodynamic, structure, transmission wavelength range, and mid-infrared emission were studied by thermal analysis, Raman spectra, transmission spectra, and photoluminescence spectra. The results showed that Al2O3-CaO-ZnO glasses possess a high glass transition temperature (~ 750 °C), low phonon energy (~ 780 cm-1), and wide transmission wavelength range (0.5 μm - 5 μm). Besides, intense 2.7 μm emissions originating from Er3+4I11/24I13/2 transition were observed in glass under 980 nm laser diode excitation. Our results indicate that Al2O3-CaO-ZnO glasses could be a potential host material for mid-infrared laser.  
    关键词:aluminate glass;Er3+ doped;2.7 μm fluorescence;mid-infrared emission   
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    发布时间:2024-03-26
  • ZHANG Cai,LIU Jiayao,WANG Qingqing

    Corrected Proof
    DOI:10.37188/CJL.20240023
    摘要:Traditional high-speed 100G lasers are generally by rectangular kovar alloy shells, also known as BOX packaging, which has high cost. Emerging Single-Wavelength 100G lasers are gradually adopting coaxial packaging, which can reduce material costs by about 50%. However, due to the integrated refrigerator inside the coaxial package and the use of a single lens solution, there are tolerances for the above two in mass production. There are tolerances and uncertainties in the optical path control, resulting in differences in the size and structure of the laser's appearance. This leads to matching issues during the assembly of the later optical modules, resulting in higher defect rates and higher costs of batch production control. In this study, the relationship between laser length and positional tolerance was analyzed through theoretical analysis and ZMAX simulations. The coupling efficiency was discussed in relation to the trends and control methods of laser length and positional tolerance. Experimental verification of laser packaging was conducted based on the theoretical analysis and simulation results. Furthermore, control methods and solutions for laser length and positional tolerance were proposed, which have guiding significance for improving laser coupling efficiency, reducing costs, and increasing production efficiency in actual batch production.  
    关键词:laser;coupling efficiency;ZMAX;tolerance   
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    发布时间:2024-03-26
  • LI Jiale,FANF Hui,GONG Shaolong,XIE Guohua

    Corrected Proof
    DOI:10.37188/CJL.20240049
    摘要:Although Organic light-emitting diodes (OLEDs) have been commercialized and become popular in smartphone, the vacuum deposition process makes them too expensive for mass production and less cost-effective. Herein, we employed highly emissive platinum complex as the sensitizer and multi-resonant thermally activated delayed fluorescence (MR-TADF) molecules as the emitters to demonstrate highly efficient, high color purity, and solution-processed OLEDs with the alleviated efficiency roll-offs. The triplet excitons are rapidly converted to singlet excitons assisted by the phosphorescent sensitizer. Attributed to the reduced triplet exciton lifetime induced by the phosphorescent sensitizer, the MR-TADF OLEDs exhibited a maximum external quantum efficiency (EQE) of 13.2% with a low efficiency roll-off of 25.8% at 1000 cd/m². To reduce Dexter energy transfer between phosphorescence sensitizer and the emitter, an analogue TADF emitter with the peripheral bulky blocking units was employed, which rendered an improved maximum EQE of 13.6%. This investigation presents a general approach to realize high-performance solution-processed electroluminescence.  
    关键词:phosphorescent sensitizer;narrow bandwidth, multi-resonance;thermally activated delayed fluorescence;organic light-emitting diodes   
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    发布时间:2024-03-25
  • MA Zejun,LI Yuan,ZHU Shenbo,CHENG Fengmin,LIU Junqi,WANG Lijun,ZHAI Shenqiang,ZHUO Ning,CHEN Yonghai,ZHANG Jinchuan,LIU Shuman,LIU Fengqi

    Corrected Proof
    DOI:10.37188/CJL.20240054
    摘要:The InAs/GaSb type-II superlattice (SL) constitutes the fundamental structure for mid-infrared optoelectronic devices, characterized by its type-II band alignment that facilitates the spatial separation of electrons and holes across the interface, and a unique atomic configuration leading to a rich variety of interface states. Building upon the Burt-Foreman envelope function theory, we investigate the influence of different interface states on the electronic states and wave functions of the superlattice. Theoretical calculations indicate that both asymmetric distributions of interface states, namely gradual interface variation and interface potential, result in spin splitting of the heavy-hole band, while spin splitting in the light-hole band occurs only with the application of an interface potential. Additionally, we examine the trends in the band gap of the superlattice system when altering well width and barrier height. The results show that as the barrier thickness increases, the gap calculations under both abrupt and gradual interface states gradually decrease, converging with increasing thickness. In contrast, the gap calculated with interface potential treatment increases with the thickness of the barrier, exhibiting an opposite trend to the former two. This provides a theoretical foundation for the precise design of mid-infrared superlattice devices.  
    关键词:antimonide;superlattice;interface state;Forward and backward difference method   
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    发布时间:2024-03-22
  • WANG Kaixuan,ZHOU Xuelian,ZHANG Yu,WANG Ze,Surilige,Muji Hala,TIAN Qixu,CHAO Kefu

    Corrected Proof
    DOI:10.37188/CJL.20240036
    摘要:White LED as the fourth generation of lighting light source has been widely used in various areas of people's life, in which phosphor is one of the key materials to obtain high performance white LED. How to prepare high-performance phosphors in a simple way is a challenging task for researchers nowadays. In this paper, BaAl4Sb2O12:Eu2+(BASO:Eu2+) phosphors were successfully prepared by using a high-temperature solid-phase method with the addition of fluxes H3BO3, NH4Cl, SrF2, LiF and BaF2. The crystal structure analysis, emission spectra, X-ray photoelectron spectroscopy (XPS), and fluorescence lifetime showed that the excess Sb2O3 could effectively reduce Eu3+ to Eu2+, increase the fluorescence intensity of Eu2+ at 563 nm by about 12.5 times, and the internal quantum efficiency (IQE) could reach 96.14 %. And the effects of different fluxes on the crystal structure, fluorescence intensity and internal quantum efficiency of phosphor were investigated. The method adopted in this experiment is simple, avoids the use of hazardous reducing gas sintering, and is easy to be applied industrially and reduce the production cost.  
    关键词:BaAl4Sb2O12:Eu2+;reduction;flux;White-LEDs   
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    发布时间:2024-03-22
  • CHEN Lei,YANG Xingyu,ZHANG Hanyue,SONG Fang,LENG Zhihua

    Corrected Proof
    DOI:10.37188/CJL.20240038
    摘要:A series of NaYSiO4:xCe3+ (0.01≤x≤0.05) blue phosphors were synthesized by high-temperature solid-state reaction method. NaYSiO4: xCe3+ phosphors have a broadband absorption in the 250-360 nm region, which can be well matched with ultraviolet (UV) LED chips. There exist multiple Ce3+ luminescence centers in the NaYSiO4:xCe3+ phosphors, which exhibits a broadband blue emission with peak wavelength near 414 nm under UV excitation. Measured across the UV region (300-350 nm), the quantum efficiencies of NaYSiO4:0.02Ce3+ phosphor can remain larger than 25%. The NaYSiO4:0.02Ce3+ phosphor shows excellent chemical stability, and its emission intensity and quantum efficiency were almost unchanged after being soaked in water for 14 days. The observed significantly spectral blue-shift and rapidly reduced half-maximum full width (FWHM) in the temperature-dependent emission spectra of the NaYSiO4:0.02Ce3+ sample can be attributed to the thermally activated phonon-assisted tunneling effect. A bright white light emitting diodes (WLED) with a color rendering index of 95 can be fabricated by depositing the NaYSiO4:0.02Ce3+ blue phosphor, commercial (Sr,Ba)2SiO4:Eu2+ green phosphor and commercial (Ca,Sr)AlSiN3:Eu2+ red phosphor on 310 nm UV LED chip. When the drive current gradually increases from 50 to 300 mA, the fabricated LED device shows a stable warm-white light emission with almost unchanged color coordinates. These results indicate that NaYSiO4:0.02Ce3+ blue phosphor reported here has a potential application in UV LED chip pumped WLED lighting.  
    关键词:NaYSiO4:Ce3+;high-temperature solid-state reaction method;blue phosphor;white light emitting diodes;high color rendering index   
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    发布时间:2024-03-18
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